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Dark Energy Spectroscopic Instrument (DESI)

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commissioning instrument

 

DESI’s Commissioning Instrument has jump-started the commissioning process for DESI by tackling some of the basic but important tasks required to bring DESI online. It successfully tested the telescope control system (TCS), telescope guiding, the image optimization system, and DESI’s algorithm that maps between sky and fiber-positioner coordinates, also known as Platemaker.

Complete Commissioning Instrument installed to Mayall telescope, ready for CI commissioning that started on 1 April 2019

The Commissioning Instrument was installed at the DESI focal plane behind the DESI Corrector during Spring 2019. Its focal surface consisted of five CCD sensors and 22 fiber-illuminated fiducials whose positions were engineered to work effectively with Platemaker. The surface was enclosed in a tall steel cylinder. The entire Commissioning Instrument was designed to have the same mass and mass distribution as DESI’s Focal Plane System to ensure realistic operations.

The focal surface of the Commissioning Instrument will have 5 CCD cameras and 22 illuminated fiducials
A rendering of the fully assembled Commissioning Instrument

The Commissioning Instrument was installed at the Mayall Telescope and began a two-month commissioning run on April 1, 2019. During Summer 2019 it was removed to make way for the installation of the DESI Focal Plane System.

Primary Sidebar

  • instrument overview
  • telescope
    • tohono o’odham
  • corrector
  • focal plane system
  • fiber system
  • spectrograph
  • instrument control system
  • data systems
  • bringing DESI to life
    • commissioning instrument
    • protoDESI

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